Looking for TVM formulas

[Dave Britten]

Awesome, I used Thomas' suggestion for calculating (1 + i%) ^ n - 1 using the more accurate e^x-1 formula, 2 * sinh(x / 2) * e ^ (x / 2), and now for the Susan example, my TI-95 program is giving me FV = -333,783.3499486. That's dead on, and one more digit than the 48SX Equation Library card gives me!

I've got a couple more things to do before the program is finished:

1. Add a numeric solver routine (tentatively going with the tiny one from the HP 20S ROM, converted for AOS)
2. Find a good way to estimate an initial guess when solving for i% or n (Or is there a direct solution for n?)
3. Add an amort function

Program size is currently 478 steps, and I figure there will be another 150-200 when all that is implemented.